Grinding-machine.



J. L w. HOLLAND-LN2.

Patented sept. 5,1916.

GRINDING MACHINE. APPLICAUON msn FEB. 1a 1915.

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UNITED STATES PATENT OFFICE.

JOHN HOLLAND-.NETZ AND` WILMAM NOLLANNfNEi-lzz, QN CROWN NOINT, INDIANA. Asslelvoas 'ro THE Lrrrz MANUFACTURINQ cpiyiraivv, or onowiv roiivr, Lantana,

A CORPORATION OF INDIANA.

GEINDING-MACHINE.

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Specification of Letters Patent.

Patented Sept. 5, 1916.

To all whom it may, concern y Be it known that we, Jol-IN HOLLAND-Larra and VILLIAM AHOLLAND-Linn, citizens of the United States, .and residents of Crown Point, in the county of Lake and State, of Indiana, have invented certain new and useful Improvements in Grinding-Machines, of which the following is a full, clear, and eX- act specification.

Our invention is concerned with grinding machines of the general class shown in the patent to Holland-Tietz, No. 1,077,714, dated November 4, 1913, and is designed to sim plify and thereby improve the construction and mounting of the stationary bur without interferingwith itsnecessary freedom of movement during the grinding operation.

To illustrate our invention, we, annex hereto a sheet of drawings, in which the same reference characters are used to designate identical: parts in all ,the figures, of which,-

Figure 1 is a central longitudinal vertical section through a portion of a grinding mill containing our improvement; Fig. 2 is a horizonal cross section of the same; Fig. 3 is a view of the back of the casing, with the burs removed; Fig. 4 is a similar view, with the stationary bur in place; and Fig. 5 is a rear elevation of the stationary bur.

In carrying out our invention, any desired form of a casing for the burs may be employed, but we preferably employ the two-part casing having the rear part 10 and the front part 11, the front part being associated with the bearing 12 for the grinding shaft 13, which extends through'the casing and is suitably journaled in the other end of the casing 14 which supports the hopper. The rotating bur 15 may be of any desired construction, provided it is suitably designed to coperate with the stationary bur.

The structure thus far described may be of any suitable construction, and forms no part of our present invention.

The rear part 10 of the casing isof a generally Cupshaped form, and has lugs 16 and 17 at the sides thereof and coperating with similar lugs 18 and 19 formed on the front portion 11 of the casing, these lugs having apertures therein for the locking bolts 20, which serve to secure the two parts of the case together. The inner face of the rear portion 10 of the casing is provided with .faces of thetwo burs may have any desired configuration, as indicated at 27.

The casing 10 has on its inner face three equi-distant lugs 28, each of which has an inclined face 29 adapted to coperate with a similarly inclined face 30 on the rear of vthe three similarly disposed lugs 31 projecting `rearwardly from the` periphery of the stationary bur 24. ,The bur 24 also has a pair of radially disposed lugs 32 and 33, which are adapte'dito coperate with lugs 34,

and 35 and 36, respectively, projecting from the inner periphery of the rear portion 10 of the casing in the same vertical plane. The coperating action of these lugs 32, 33, 34, 35 and 36 serves to prevent the possible rotation of the stationary bur 24 as a result of the movement of the rotating bur, while not interfering at all with the movements of the stationary bur to and from the rotating bur necessary to accommodate the materials being ground as they pass between the burs. The coperating action of the lugs 28 and 31 serves to center the stationary bur accurately, and we have found by actual practice that this simplified construction wo-rks just as freely, and is much more durable and desirable than the more complicated construction shown in the aforesaid Patent No. 1,077,714, where two additional annuli were employed to secure the desired trammeling movement of the stationary bur.

7hat we claim as new, and desire to secure by Letters Patent of the United States, is:

1. In a grinding machine, the combination with a grinding casing member having a centrally located feeding aperture therein, of a stationary bur member, consisting of an annular disk having a central feeding aperture registering with the grinding-casingmember feeding-aperture, one of said members having a plurality of bearing surfaces projecting beyond its face near its periphery on the side adjacent the other member, and said other member having a similar plurality of correspondingly inclined bearing surfaces engaging the cooperating surfaces, connections between the casing member and the bur member to prevent the rotation of the latter while not interfering with its movement to and from the casing, connections between the adjacent faces of the casing member and bur member adjacent the feeding apertures to prevent the material passing between said adjacent faces, a shaft extending into the casing member, and a second bur coperating with the first-mentioned bur-member secured on said shaft to rotate therewith.

2. In a grinding machine, the combination with a grinding casing member having a centrally located feeding aperture therein closely surrounded by an annular channel, of a stationary bur member consisting of an annular disk having a central feeding aperture registering with the grinding-casingmember feeding-aperture and surrounded by an annular ange on its rear face projecting' into the aforesaid annular channel, both of said members having a plurality of inclined bearing/surfaces projecting beyond the adjacent faces near their peripheries and cooperating. with the corresponding bearing surfaces on the other member, packing in the annular channel adapted to be engaged by the annular flange, connections between the casing member and the bur member to prevent rotation of the latter while not interfering with its movement to and from the casing, a shaft extending into the casing member, and a second bur coperating with the first secured on said shaft to rotate therewith.

3. In a grinding machine, the combination with a grinding casing member, of a stationary bur member, said members being provided with contacting surfaces to permit of the proper centering of the bur member, connections between the casing and the bur to prevent the rotation of the latter, a shaft extending into the casing, a second bur cooperating with the first secured on said shaft to rotate therewith, and a casing cover member coperating with the casing member and overhanging portions of the stationary bur member to limit the movement of the same away from the casing member.

YIn witness whereof, we have hereunto set our hands and aiiiXed our seals, this 6th day of February, A. D. 1915.

JOHN HOLLAND-LEITZ. WILLIAM HOLLAND-LETZ.

Witnesses:

LoUis H. HOFFMANN,- RAYMOND SHERMAN.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

